1. Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ London, UK
2. Institute of High Performance Computing, A*STAR, Singapore
3. School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Drive, 637459, Singapore
4. Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
5. Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
6. Department of Mathematical Sciences, University of Bath, Claverton Down, Bath, BA2 7AY, UK
7. Department of Mathematics, University College London, Gordon Street, London, WC1H 0AY, UK
8. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Centre for Mathematical Sciences, CB3 0WA, UK